The King Fridays Dungeon Puppet Slam happens annually at Mayo Street Arts. The slam is part of the national Puppet Slam Network created by Heather Henson, and curated by local Maine puppeteers.

King Friday, post-monarch, deposed and living in squalor beneath an old vaudeville house hath requestedeth new puppet works and puppet works-in-progress for an impromptu, after-hours, puppet-roadhouse show.